From: Marcelo Tosatti <marcelo-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>
To: Anders <mail-e0wP/LNAh+3kORH8mtz0xlpr/1R2p/CL@public.gmane.org>
Cc: Marcelo Tosatti <marcelo-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: [PATCH] report revision 3 of the ACPI/SMBus PIIX4 controller
Date: Mon, 14 Jan 2008 11:24:14 -0200 [thread overview]
Message-ID: <20080114132414.GA15200@dmt> (raw)
In-Reply-To: <878x2tzpx4.fsf-MhEMtRviUwpApvB0Y80ENH9LOBIZ5rWg@public.gmane.org>
On Sun, Jan 13, 2008 at 04:49:27PM +0100, Anders wrote:
> Marcelo Tosatti <marcelo-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org> writes:
>
> > On Sun, Jan 13, 2008 at 12:19:20PM +0100, Anders wrote:
>
> [...]
>
> >> How do you get that high consumption? What combination of clocks/hz on
> >> host/guest are you using?
> >
> > CONFIG_HZ=250
>
> Okay, with nohz=off (in the guest) I also see some higher load. I
> didn't try the patch, though.
>
> > UP guests use TSC as a clocksource by default, and TSC reads won't
> > cause a VMExit.
>
> So for the lightest load (power saving), I should use UP and TSC?
Yes.
As you note NOHZ also helps dramatically.
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prev parent reply other threads:[~2008-01-14 13:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-11 21:26 [PATCH] report revision 3 of the ACPI/SMBus PIIX4 controller Marcelo Tosatti
2008-01-11 21:26 ` [Qemu-devel] " Marcelo Tosatti
2008-01-13 10:25 ` Avi Kivity
2008-01-13 10:25 ` [Qemu-devel] Re: [kvm-devel] " Avi Kivity
2008-01-13 11:19 ` Anders
[not found] ` <87ve5yynuv.fsf-MhEMtRviUwpApvB0Y80ENH9LOBIZ5rWg@public.gmane.org>
2008-01-13 14:22 ` Marcelo Tosatti
2008-01-13 15:49 ` Anders
[not found] ` <878x2tzpx4.fsf-MhEMtRviUwpApvB0Y80ENH9LOBIZ5rWg@public.gmane.org>
2008-01-14 13:24 ` Marcelo Tosatti [this message]
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